VO l889. n '] PEOCEEDINGS OF THE NATIONAL MUSEUM. 625 



ing from 6 inches to 1 foot of water. At the mouth of these burrows 

 were mud chimneys 5 inches high. The soil was blue clay mixed with 

 sand and gravel. At least three species build chimneys, viz : G. diog- 

 enes, G. argillicola, and G. dubius. 



The specimen from Kelley 7 s Island, Lake Brie, Ohio, inadvertently 

 referred to G. diogenes in my Revision, p. 71, is G. argillicola. I have 

 not yet seen G. diogenes from the State of Ohio. 



Cambarus setosus Fax. 



Cambarm setosus Faxon, Bull. Mus. Coinp. Zool., xvn, No. 6, 1889, p. 237, pi. I, 

 figs. 1, 2,3, 7, pi. ii, fig. 1. 



Eostrum rather short, triangular, slightly concave above, terminat- 

 ing in a short, upturned horny tip ; sides convex, raised into sharp 

 crests ; no lateral teeth except in small specimens which show a rudi- 

 mentary spiny tooth on each side of the base of the acumen ; margins 

 setiferous. Post-orbital ridges obsolescent, destitute of spines. Cara- 

 pace subcylindrical, flattened above, the region behind the cervical 

 groove very long ; smooth and punctate above, granulate on the 

 hepatic and branchial areas ; a small spine on the antero-lateral bor- 

 der, a little way above the anterior end of the cervical groove. Areola 

 very narrow, sides subparallel for some distance. Abdomen longer 

 than the cephalothorax, sparsely setose ; pleura rounded ; telson of 

 moderate length, proximal segment bispinose (occasionally trispiuose) 

 on each side. Anterior process of the epistoma broadly transverse, 

 anterior border notched or dentate. Sternum tuberculate between the 

 first to third pairs of legs. Eyes and eye-stalks rudimentary, but not 

 wholly covered by the rostrum. Basal segment of the antennule fur- 

 nished with a sharp spine below, near the distal end. Antennae as 

 long as, or longer than, the body; antennal scale surpassing the rostrum, 

 very broad, the broadest part near the distal end ; outer margin setose, 

 convex, inflated, ending in a sharp but not very long spine. Third 

 maxillipeds hirsute. Ohelipeds of moderate length; chela long, setose, 

 inner and outer margins of the hand provided with blunt tubercles 

 irregularly disposed in a double row; fingers, long, incurved, opposed 

 edges straight, bluntly toothed near the base, finely pectinate throughout 

 their length, tips curved, corneous and acute. Carpus armed with a 

 prominent internal median and inferior median spine ; in addition to 

 these there are in older specimens a variable number of small spines on 

 the inner, lower, and outer faces. Upper margin of the meros spinu- 

 lose, lower face with the usual biserial arrangement of spines. 



In the male the third pair of legs is hooked on the third segment. 

 The first abdominal appendages are similar to those of G. bartonii, end- 

 ing in two recurved hooks, the outer of which is corneous and acute in 

 in form I, the inner long, slender, and membranaceous. In form II 

 both hooks are membranaceous, short, blunt, and not so widely sepa- 

 rated as in form I. 



Proc. N. M. 89 40 



